[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Emergency Control for Improving Transient Stability of Integrated Systems with Photovoltaic and Hydropower Stations Based on EEAC Theory

摘要： Integrated systems with photovoltaic (PV) and hydropower stations can make full use of energy. However, the system may be prone to transient instability due to the weak grid and low inertia characteristic of PV stations. This paper presents an emergency control method for transient stability enhancement of the integrated system with PV and hydropower stations based on the extended equal area criterion (EEAC) theory. Firstly, when the system is disturbed, it can be equivalent to a single machine infinite system. Subsequently, the equivalent electromagnetic power curve is fitted considering the influence of PV stations based on the least square method. Moreover, the equal area criterion is used to determine the control quantity of generator tripping. Finally, simulation results provided by BPA are performed to validate the effectiveness of the proposed method.